PCIE HBA and PCIE GbE Card in single x8 Slot using splitter

[seb101]

I only have a single PCIE 2.0 x8 slot on my SuperMicro board and a desire to be running both a LSI HBA and an 10GbE card.

There is a SuperMicro PCIE 'dual riser' available, the RSC-R2UU-2E4R. This splits the bandwidth equally, creating 2 x4 bandwdith slots (in x8 form factor).

The datasheet for the HP 10GbE card I am looking at also confirms it will operate in x4 mode (source https://h20195.www2.hpe.com/v2/getdocument.aspx?docname=c04111686 )

It would appear the LSI 9211-8i HBA also supports operating in x4 mode (source: https://docs.broadcom.com/docs/12353333 )

As the table from the LSI specification states, at x4 bus mode each card will be getting 20Gb/s single direction bandwidth.

This should be plenty to drive a single 10GbE slot at full speed, with data coming from the HBA.

Aside from the physical challenge of fitting everything in the case (I plan to put the 10GbE card in the actual PCIE slot then mount the HBA card somewhere internally) is there any reason this will be more complex than I'm imagining?

Cheers!

 

[artlessknave]

the motherboard must support PCIe splitting for this to work at all afaik, but any PCIe card will work at 1x up to 16x speed depending on what lanes are available to it and it's physical connectors.
I dont see the mobo listed in your post so i have way to look it up, which is why the forum rules are to list the hardware.
as long as it works at all, you should be able to get enough performance for the your goal.